Web pick-up arrangement for paper making machines

ABSTRACT

WEB PICK-UP ARRANGEMENT FOR FOURDRINIER TYPE PAPER MAKING MACHINE, PARTICULARLY ADAPTED TO PICK-UP NEWLY FORMED HEAVY WEIGHT WEBS FROM THE FORMING WIRE AND TO TRANSFEWR THE WEBS DIRECTLY TO THE PRESS FELT WITHOUT THE USE OF A PICK-UP FELT OR FABRIC. THE PICK-UP INCLUDES A PICK-UP ROLL, WHICH MAYH BE A PLAIN SURFACED ROLL AND HAS NIP PRESSURE COOPERATION WITH WIRE AS THE WIRE PASSES ABOUT A RETURN ROLL INTO ITS RETURN RUN FOR CLEANING. THE PRESS FELT IS MAINTAINED IN PRESSURE COOPERATION WITH THE PICK-UP ROLL BY A TRANSFER DEVICE ABOUT WHICH THE PRESS TURNS TO ITS UPWARDLY FACING PRESS RUN. THE TRANSFER DEVICE INCLUDES AN IDLER ROLL DISPOSED BENEATH AND REARWARDLY OF THE PICK-UP ROLL AND A SUCTION ROLL OR SUCTION BOX DISPOSED ON THE UNDERSIDE OF THE PRESS FELT EITHER AT THE POINT OF NIP ENGAGEMENT OF THE PRESS FELT TO THE PICK-UP ROLL OR ON THE OUTGOING SIDE OF THE PICK-UP ROLL.

Aug. 10, 1971 T, cKn: ETAL 3,598,697

WEB PICK-UP ARRANGEMENT FOR PAPER MAKING MACHINES Filed March 6, 1969 2 Sheets-Sheet 1 I N VENTORj 720/ 44 5 G. /f

Aka/mp J 001 1/77 w L-MA%TTORNEYS Aug. 10, 1971 cK E EFAL 3,598,697

WEB PICK-UP ARRANGEMENT FOR'PAPER MAKING MACHINES Filed March 6, 1969 1 2 Sheets-Sheet 2 INVENTORS 2/0/1445 6. M044: flfi/vmo J. 5(A/M/77' M 40 0 WATTORNEYS United States Patent 3,598,697 WEB PICK-UP ARRANGEMENT FOR PAPER MAKING MACHINES Thomas G. McKie and Arnold J. Schmitt, Beloit, Wis., assignors to Beloit Corporation, Beloit, Wis. Filed Mar. 6, 1969, Ser. No. 804,827 Int. Cl. D21f 2/00 US. Cl. 162-306 2 Claims ABSTRACT OF THE DISCLOSURE Web pick-up arrangement for Fourdrinier type paper making machine, particularly adapted to pick-up newly formed heavy weight webs from the forming wire and to transfer the webs directly to the press felt without the use of a pick-up felt or fabric. The pick-up includes a pick-up roll, which may be a plain surfaced roll and has nip pressure cooperation with the wire as the wire passes about a return roll onto its return run for cleaning. The press felt is maintained in pressure cooperation with the pick-up roll by a transfer device about which the press felt turns to its upwardly facing press run. The transfer device includes an idler roll disposed beneath and rearwardly of the pick-up roll and a suction roll or suction box disposed on the underside of the press felt either at the point of nip engagement of the press felt to the pick-up roll or on the outgoing side of the pick-up roll.

SUMMARY AND OBJECTS OF THE INVENTION Pick-up particularly adapted for heavy weight webs in high speed paper making, in which the usual felt or fabric pick-up is eliminated and a plain surfaced pick-up roll has direct pressure nip engagement with the wire as it passes about a suction roll to change its direction to its return or cleaning run, and transfers the web directly to a transfer roll and to the press felt, as traveling about or having nip engagement with the transfer roll.

A principal object of the present invention is to provide an improved form of web pick-up arrangement for picking the web from its forming wire and transferring the web directly to a press felt without the use of the usual felt pick-up.

Another object of the invention is to provide a simple and improved form of pick-up for Fourdrinier type paper making machines, particularly adapted for heavy weight webs, in which the efficiency of pick-up of the web from the wire is attained by transferring the web from the wire directly to the press felt as traveling about a transfer roll spaced from the wire.

A further object of the invention is to improve upon the pick-ups of newly formed heavy weight webs or sheets on a Fourdrinier wire, by utilizing a pressurized plain surfaced pick-up roll in nip cooperation with a suction roll about which the wire turns onto its return path, and also having pressure nip cooperation with a press felt spaced from the wire as the press felt turns about a transfer roll onto its press run.

Still another object of the invention is to improve upon the systems of picking up and transferring heavy weight sheets from the forming wire to the press felt by utilizing a plain surfaced pick-up roll having pressure nip engagement with the wire as it turns about its suction roll, and by changing the direction of the press felt to the press run about a suction transfer roll adjustably mounted to have nip pressure engagement with the pick-up roll in spaced relation with respect to the forming wire.

These and other objects of the invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawing.

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DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic view schematically illustrating one form of pick-up arrangement constructed in accordance with the principles of the present invention.

FIG. 2 is a diagrammatic view of the pick-up end of a paper making machine schematically illustrating a modified form in which the principles of the present invention may be carried out.

FIG. 3 is a diagrammatic view schematically illustrating still another modification of the invention.

FIG. 4 is a diagrammatic view schematically illustrating a further manner in which the invention may be carried out; and

FIG. .5 is still another diagrammatic view schematically illustrating a modified form of the invention in which a pick-up felt may be used to carry the web in the nip between the couch roll and pick-up roll.

DESCRIPTION OF PREFERRED EMBODIMENTS OF INVENTION In FIG. 1 of the drawings, we have shown the discharge end portion of the forming run of a looped Fourdrinier wire 10, changing its direction about a suction roll 11, shown as being a couch roll and having a suction box 12 for drawing water through the wire from a sheet or web W on the wire. As shown in FIG. 1, the wire 10 passes partially about the couch roll 11 on its return run, where it may be cleaned prior to passing along its forming run.

Spaced in advance of the suction roll 11 is a transfer roll 13, which is also shown as a suction roll having a suction box 15 therein. A press felt 16- passes about the transfer roll 13, which trains the felt along an upwardly facing press run between a lower press roll 17 and an upper press roll 18, having pressure nip defining relation with the press roll 17. The press roll 17 is shown as being a suction roll, but may also be a grooved roll having an imperforate shell, as described and claimed in the E. I. Justus -U.S. Pats. Nos. 3,198,693; 3,198,694; 3,198,695; 3,198,696; and 3,198,697. The press roll 17 serves as a dewatering roll in a conventional manner.

Between the suction roll 11 and transfer roll 13 and shown in FIG. 1 as being above said rolls is a pick-up roll 21 having nip cooperation with said suction roll and said transfer roll. Said pick-up roll 21 may establish pressure nips between the rolls 11 and 13. The pick-up roll 21 is adjustably movable toward and from the suction roll 11, as indicated by the double headed arrow and designated by reference numeral 22. The nip between said rolls may be loaded in various manners, as by loading the bearings or shaft of said pick-up roll or by internally loading said pick-up roll by fluid force transferring means of a conventional construction.

The pick-up roll 21 is shown as being a plain surfaced roll having a plain cylindrical surface, which may be rubber-covered, and may be driven by contact with the wire and web traveling about the suction roll 11- and by contact with the press felt and web traveling about the transfer roll 13, or may be driven by power at the same peripheral speed as the peripheral speeds of the suction roll 11 and transfer roll 13. A doctor 23 is spaced circumferentially of the incoming nip between the pick-up roll 21 and suction roll 11 to keep the surface of the pick-up roll 2'1 clean.

The plain cylindrical surface of the pick-up roll 21, as engaged with the wire traveling about the suction roll 11 under pressure, may serve as a lumpbreaker roll in addition to transferring the web onto the press felt as turning about the transfer roll 13.

The transfer roll 13 may be adjustably movable toward 3 and from the periphery of the pick-up roll 21 to provide an open nip for start up of the machine, as indicated by the double headed arrow 25, and to cooperate with said pick-up roll and provide the required pressure nip between said rolls.

In the form of the invention just described, the pick-up roll 21 serves to transfer the web from the wire that is traveling about the suction roll 11 to the upper surface of the press felt as traveling about the transfer roll 13, and may be pressurized to provide a pressure nip between the rolls 11 and 21 and serves as a lumpbreaker roll in addition to a pick-up roll. The pick-up roll 21 thus transfers the web directly to the top surface of the press felt to be carried between the press rolls, and obviates the necessity of using a pick-up felt to pick the web from the forming wire.

In the form of the invention illustrated in FIG. 2 of the drawings, the wire having a newly formed web W thereon is trained about the suction roll 11 downwardly and forwardly therefrom and about a second suction roll 26, shown as being a contact roll, training the wire under tension into a downwardly inclined generally forwardly and upwardly facing pick-up run R. From the suction roll 26, the wire travels on its return path through the conventional cleaning arrangements back to its forming run.

As shown in FIG. 2, a first lumpbreaker roll 27 has pressure nip cooperation with the wire and web as it passes about the suction roll 11. The pressure of the nip between the wire and lumpbreaker roll as it passes about the roll 11 may, for example, be in the range between 75 to 150 pounds per lineal inch. The adjustability of the first lumpbreaker roll 27 toward and from the suction roll 11 is designated by a double headed arrow, generally indicated by reference character 29.

A second lumpbreaker roll 30 has pressure nip cooperation with the suction roll 26 and a spaced transfer roll 31. The second lumpbreaker roll serves as a pick-up roll to transfer the web from the wire to the outer surface of a press felt 32, changing its direction into an upwardly facing press run about the transfer roll 31, and passing the web into the nip between a pair of vertically spaced press rolls 33 and 35. The press roll 33 like the press roll 18 may be a plain roll defining a pressure nip with the press roll 35, shown as being a suction roll. The roll 35 may, however, be a grooved roll (not shown).

The second lumpbreaker or pick-up roll 30* is adjust- 'ably movable toward and from the suction roll 26 and the wire trained thereabout as dwignated by the double headed arrow indicated generally by reference numeral 36. The lumpbreaker or pick-up roll 30' may also be loaded by adjustably loading the bearings of the roll, or by any other conventional loading means, to provide a preselected pressure nip between said lumpbreaker roll and the suction roll 26.

The transfer roll 31 may also be adjustably moved toward and from the periphery of the lumpbreaker roll 30, to open the nip between said rolls in a conventional manner for start up of the machine, and to close and load the nip between said rolls 31 and 30- where required. The adjustable means may be of any suitable form and is designated by the double headed arrow indicated by reference numeral 37. The transfer roll 31 is a suction roll having a suction box 39 therein.

In this form of the invention, the wire travels about the two suction rolls 11- and 26, and the first and second lumpbreaker rolls have pressure nip engagement with the suction, couch and contact rolls, while the second lumpbreaker roll also forms a pick-up roll, picking the web from the wire and transferring the web to the press felt, as it travels about the suction roll 31. A doctor 40', like the doctor 23-, is provided to doctor the surface of the roll 30* clean.

In the form of the invention illustrated in FIG. 3, the wire 10 travels about a couch ro l 1 hown as being 4 a plain roll, but which may be a suction or grooved roll. The wire 10 having a newly formed web W thereon, travels about the couch roll 11a along a downwardly inclined upwardly facing pick-up run R and around a contact roll 41, spaced downwardly of and in advance of the couch roll 11a, and shown as being a suction roll having a suction box 43 therein.

A transfer roll 45 having a press felt 46 trained thereabout is spaced from the suction contact roll 41 and changes the direction of the press felt 46 to pass between a pair of press rolls 47 and 48. While the press rolls 47 and 48 are shown as plain rolls, it should be understood that at least the press roll 48 may be a suction or a grooved roll. The transfer roll 45 is shown as being a plain roll, but may be a suction roll under certainoperating conditions.

A pick-up roll 49 is shown as being disposed between the contact roll 41 and transfer roll 45 (with its axis of rotation disposed beneath the axes of rotation of said contact and transfer rolls. Said pick-up roll has nip defining relation with said rolls 41 and 45. The roll 49 is shown by the double headed arrow 50 as adjustable in a suitable manner, toward and from the rolls 41 and 45 to accommodate start up of the machine and also to load the roll and provide preselected pressure nips between said roll and the rolls 41 and 45.

In FIG. 3, the roll 49 is shown as having pressure nip engagement with the press felt 46 as it enters the nip between the rolls 49 and 45. We have, however, also shown by dashed lines an alternate position of the roll 45 in which said roll is positioned above its solid line position and the pick-up roll 49 contacts the press felt 46 prior to turning about the roll 45 in its dashed position, and transfers the web directly to the felt before it turns about said transfer roll 45.

In FIG. 4 of the drawings, the forming wire 10, having a newly formed web W thereon, passes about a couch roll 11b, shown as being a suction roll having a suction box 12b therein, of a conventional construction. A contact roll 53 is spaced downwardly and forwardly of the suction roll 11b and maintains the wire under tension and changes the direction of the Wire to travel along its return run over an idler 54. The contact roll 53 is shown as being a plain roll, but may also be a suction or grooved roll under certain operating conditions. A pick-up roll 55 has pressure nip engagement with the contact roll 53 and Web and wire traveling thereabout and picks the newly formed web from the wire at the bottom of the contact roll and transfers the web to an upwardly facing felt run of a press felt 56. The press felt 56 is shown as turning about an idler 57 at the incoming end of the press run, and disposed beneath and rearwardly of the axis of rotation of the pick-up roll 55. From the idler 57 the press felt is trained under and along said pick-up roll into engagement therewith and upwardly therefrom in the nip between two press rolls 58 and 59, which may be like the press rolls 47 and 48. The pick-up roll 55 is adjustably movable relative to the contact roll 53 in a conventional manner as indicated by the double headed arrow designated by reference numeral 60 and may be opened relative to the roll 53 to provide an open nip between said rolls and also may be loaded into engagement with the roll 53 to provide a pre-selected pressure 111p.

In this form of the invention, a suction box 61 is shown as being disposed beneath the press felt 56 on the outgoing side of the pick-up roll 55, or at the point of nip engagement of the felt '56 and roll 55, as the press felt 56 and web W thereon pass to the press rolls 58 and 59. The suction box 61 is diagrammatically shown as having a suction opening 62 with bars or round rods 63 and 64 extending along opposite sides of the suction opening. As shown in FIG. 4, the incoming rod 63 is spaced from the underside of the felt to provide an air bleed along the underside of the felt while the outgoing rod 64 has engagement with the underside of the felt and serves as a guide therefor and seals the outgoing side of said suction opening.

In FIG. 4, an alternate position of the press rolls 58 and 59 is shown by dashed lines. In this position the press rolls 58 and 59 have been lowered and the suction box 61 has been eliminated. The suction box 61, however, may be used under certain operating conditions and when so used, is positioned relative to the web 56 and press rolls 58 and 59 in the same general manner as in the solid line position of the press rolls 58 and 59.

In FIG. 5, we have shown a wire arrangement in which the forming wire 10 has an inclined forming surface inclined downwardly from a breast roll 65 to a couch roll 66, about which the wire turns onto its return run. The couch roll 66 is shown as being a grooved roll to accommodate the circulation of air between the Wire and roll and the draining of water from the wire and web thereon. A suction roll 67 is shown as being disposed beneath the couch roll 66 and as having a high vacuum pick-up suction box 69 therein and a low vacuum holding suction box 70 extending along the inside of the pick-up roll and holding the web to the undersurface of a pick-up felt 71, to be carried for further treatment, in a conventional manner. The pick-up roll 67 is adjustable and loadable as indicated by the double headed arrow 72 to provide a pre-determined pressure nip between the rolls 66 and 67 and to separate the rolls for start up of the machine.

In this form of the invention, the pick-up felt carries the newly formed web on its undersurface through the conventional press rolls (not shown). The pick-up felt 71 may be an endless belt of felt or other porous fabric and is trained by a nip idler 73 disposed rearwardly of and above the couch roll 66, to come in contact with the web as it passes with the Wire about said couch roll, tangentially of the peripheral surface of said couch roll. The nip roll 73 may be adjustably movable toward and from the web W and wire 10, to provide a preselected nip angle, as indicated by the double headed arrow 75. A save-all 76 is shown as extending across the couch roll 66, adjacent the pick-up roll 67 to collect water thrown from the felt as the felt, web and wire pass about the couch roll 66.

The form of the invention shown in FIG. differs from the forms of the invention illustrated in FIG. 4 in that a pick-up felt 71 picks the web from the wire and transfers the web to travel about the peripheral surface of the suction pick-up roll 67, for transfer and passage between the conventional press rolls. With certain heavy weight webs the pick-up felt need not necessarily be used, but a press felt may carry the web along its top surface to the conventional press rolls as in the form of the invention illustrated in FIG. 4. The modification illustrated in FIG. 5, therefore, is adapted for heavy Weight sheets but may be efiiciently used for lighter weight sheets or webs, than the form of the invention illustrated in FIG. 4.

While we have herein shown and described several forms in which the invention may be embodied, it may readily be understood that various variations and modifications thereof may be attained, without departing from the spirit and scope of the novel concepts thereof.

We claim as our invention:

1. A web pick-up arrangement for a paper making machine, comprising in combination,

a Fourdrinier wire having a generally uni-planar form ing run traveling under tension with a newly formed web thereon,

a couch roll defining the end of said forming run,

a contact roll tensioning the wire into a downwardly inclined pick-up run,

a plain surface pick-up roll having pressure nip relation with the wire as it turns about said contact roll,

a press felt,

transfer means training the press felt to have nip pressure relation with said pick-up roll in circumferentially spaced relation relative to the pressure nip relation of said pick-up roll with said contact roll, said transfer means including an idler roll spaced rearwardly of said pick-up roll and a suction box spaced from said idler in an uprunning direction and extending across said press felt along the underside thereof and along the outgoing nip, said nip being between said press felt and said pick-up roll.

2. A web pick-up arrangement for a paper making machine, comprising, in combination,

a Fourdrinier wire having a generally uniplanar forming run traveling under tension with a newly formed web thereon,

a couch suction roll defining the end of a forming run,

a plain surface contact roll tensioning the wire into a downwardly inclined pick-up run,

a plain surface pick-up roll disposed beneath said contact roll and having a pressure nip relation with the wire as it turns about said contact roll,

a press felt,

transfer means training the press felt to have nip relation with said pick-up roll in circumferentially spaced relation relative to the pressure nip relation of said pick-up roll with said contact roll, said transfer means including a suction means extending across said press felt along the underside thereof on the outgoing side of the pick-up roll, an idler roll spaced beneath and rearwardly of the pick-up roll, and press rolls spaced above and forwardly of said pick-up roll.

References Cited UNITED STATES PATENTS 2,850,951 9/1958 Holden 162-305 3,441,476 4/1969 Schiel 162-306 FOREIGN PATENTS 436,959 11/1926 Germany.

1,178,691 7/1958 Germany.

S. LEON BASHORE, Primary Examiner T. G. SCAVONE, Assistant Examiner US. Cl. X.R. 162-358 

